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I have a laptop toshiba satallite L655 with ATI Radeon HD 5650.
I have a problem in my super key for the brigthness.
When ever i press FN+f6 or FN+f7 to increase or decrease the light, nothing happens. By the way, this problem started when i installed my graphic card driver from Ubuntu Additional Drivers ... please can any one help me!!!

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this problem happen when i restart the computer or start it...and it dosen't happen regualry... – Hussien gamal May 24 '12 at 23:59

This worked for me : Re: Controlling brightness on 12.04 Toshiba L650 and I am on a L455D-S5976

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Whilst this may theoretically answer the question, it would be preferable to include the essential parts of the answer here, and provide the link for reference. – Eliah Kagan Jul 2 '12 at 11:21

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